Kemayoran Airport (Indonesian: Bandar Udara Kemayoran) (formerly IATA: JKT, ICAO: WIID), also known in its old spelling as Kemajoran, was the principal airport in Jakarta, Indonesia from 1940 until 1985. Kemayoran was built during Dutch East Indies administration by the Department of Transport, Public Works and Irrigation in 1934 on the land that was formerly swamps, rice fields, and residential areas.

It was officially opened on 8 July 1940. However, the airport began operations on 6 July 1940, with the landing of the first aircraft, a DC-3 Dakota owned by the Royal Dutch East Indies Airways (KNILM), which had flown from Tjililitan Airfield. It was the first airport in Dutch East Indies to be opened for scheduled international flights.

During World War II, Kemayoran was used by the Royal Air Force and became RAF Kemajoran. It was one of their RAF stations in Southeast Asia until it was captured by the Japanese Imperial Army in 1942.

After Indonesia gained independence, the government under President Sukarno began upgrading terminal buildings, runways, taxiways, aprons, hangars, operational equipment and constructing a new international terminal building to accommodate foreign tourists and as part of His grand plan to beautify the capital city of Indonesia.

Due to increasing air traffic in Indonesia and Jakarta's increasingly crowded spatial layout, flights in the middle of the city are starting to be considered unsafe. The airport's capacity can no longer be expanded, forcing the government under President Suharto to consider constructing a new international airport with greater facilities and capacity as soon as possible.